Owned by Six Flags Entertainment Corporation, the park opened in 1976 and features over 75 rides and attractions including eight roller coasters.

Valleyfair also has a water park called Soak City which is included with the price of admission.

In 1978 in an effort to increase investment capital for continued park expansion, Valleyfair was acquired by Cedar Point in Sandusky, Ohio.

Planet Snoopy is a kids area within the park created for the 2011 season as part of a $9 million expansion.

"The Route 76 area takes guests back into amusement park Americana" with the reopening of three classic rides that made their debut in the opening of Valleyfair in 1976.

These rides include the Antique Autos, which was formerly deconstructed to make room for the construction of Dinosaurs Alive!, the Tilt-a-Whirl, and the Scrambler.

This family-oriented ride reaches speeds upwards of 43 miles per hour and resembles the Aurora Borealis at night with colored lights in shades of greens, blues, and purples.

Valleyfair hosts several performance venues with a wide variety of live entertainment at no additional charge.

The Great Pumpkin Fest is a family-friendly Halloween event open during the day, while the park is under normal operation.

[32] On April 2, 2024, Valleyfair announced the return of ValleySCARE for the 2024 operating season, with it now being a separate ticketed event in the evenings.